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// in the documentation and/or other materials provided with the
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package com.google.jgments;

import java.util.regex.MatchResult;

/** Class that adapts a single match group as a {@link MatchResult}. */
public class SyntheticMatchResult implements MatchResult {

  private int groupStart;
  private int groupEnd;
  private String groupContents;

  /** Constructs a SyntheticMatchResult from the given group of a {@link MatchResult}. */
  public SyntheticMatchResult(MatchResult m, int index) {
    groupStart = m.start(index);
    groupEnd = m.end(index);
    groupContents = m.group(index);
  }

  public String group() {
    return groupContents;
  }

  public int start() {
    return groupStart;
  }

  public int end() {
    return groupEnd;
  }

  // This class only implements a single group.

  public int groupCount() {
    return 0;
  }

  public String group(int index) {
    if (index == 0) {
      return group();
    }
    throw new IndexOutOfBoundsException();
  }

  public int start(int index) {
    if (index == 0) {
      return start();
    }
    throw new IndexOutOfBoundsException();
  }

  public int end(int index) {
    if (index == 0) {
      return end();
    }
    throw new IndexOutOfBoundsException();
  }
}
